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(1) Let
, Find grad(f)..(2) Identify the points at which grad(f) is
a) orthogonal to the z-axis
b) parallel to the x-axis
c) zero.
I have managed to solve for (1), but don't have a clue how to solve the second part. I have not come across about the theory of "orthogonal to z-axis" and "parallel to x-axis", tried to look up on the internet but still quite confused.
However, for (c) I have come up with something like
, so the points at which grad(f)=0 are (0,0,0). Is that right?Offline
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